The Raspberry Pi Thread [4]

@badrobot

nice work.

alphanumeric said:

Just did up a new card with Stretch and ran the one line installer for VLCRadio (Pirate Radio). Audio was still scratchy, but after manually doing the edit it sounds Ok.
sudo nano /usr/bin/vlcd
Mine was showing compressor-makeup-gain 12.0. I changed it to compressor-makeup-gain 0.0. No pops on channel change either. :)

Isn't the popping sound due to ground loop noise?
I have that issue with my Google Asst project but since the speaker is connected via aux, I added an isolator in between which instantly fixed the problem.

https://www.googleadservices.com/pag...G0Q0Qx6BAgVEAE

badrobot said:

Isn't the popping sound due to ground loop noise?
I have that issue with my Google Asst project but since the speaker is connected via aux, I added an isolator in between which instantly fixed the problem.

https://www.googleadservices.com/pag...G0Q0Qx6BAgVEAE

It's an issue with the DAC on the pHat Beat and how the sound stream is stopped, then started again, when you switch to a new steam (channel). There was a pop when the music stopped, then another when it started again. You only heard them when switching channels. Or shutting down. Now you get one little one on boot up. and one on shut down. Non when changing channels though. They were loud and a bit annoying.

caperjack said:

good idea ,,,,new from Pimoroni ,,,,pogo pins
https://shop.pimoroni.com/collection...gpio-pogo-pins

Interesting, I'm on the fence as to whether I'd use them or not. They will reduce your height, so they may be advantageous in tight courters. 7mm compressed, regular standoffs are 11mm. No stacking more than two boards either, one Pi and one pHat.

I always wanted to try adding DAC to my Google Assistant project but the problem is I am using several GPIO pins for LED indicators and power supply and it might get in the way.

badrobot said:

I always wanted to try adding DAC to my Google Assistant project but the problem is I am using several GPIO pins for LED indicators and power supply and it might get in the way.

You can check the pins used here, https://pinout.xyz/boards#
I think you'll find most use i2s, https://pinout.xyz/pinout/phat_dac#
Ant the more extras they have like buttons, VU meter, the more extra GPIO pins they use. https://pinout.xyz/pinout/phat_beat#
If you this, https://pinout.xyz/phatstack just add what you have now, if its in the list. Then add what DAC board you think you might want to use and it will tell you if there is a conflict. Ignore that its for a pHat Stack. That doesn't really matter, it just looks for conflicts between GPIO pins used. The pHat Stack is just daisy chained GPIO connectors.

caperjack said:

I think i would like to have a set ,just so i could have one Pi Zero-W with out a header soldered on ,so i could use it with 2 different hats .

I'll likely add one to an order at some point. Just to have on hand in case I find a use for it. It would be interesting to see if you could line them up with the Pi Zero test points, using the Proto Zero, or Proto pHat?

alphanumeric said:

You can check the pins used here, https://pinout.xyz/boards#
I think you'll find most use i2s, https://pinout.xyz/pinout/phat_dac#
Ant the more extras they have like buttons, VU meter, the more extra GPIO pins they use. https://pinout.xyz/pinout/phat_beat#
If you this, https://pinout.xyz/phatstack just add what you have now, if its in the list. Then add what DAC board you think you might want to use and it will tell you if there is a conflict. Ignore that its for a pHat Stack. That doesn't really matter, it just looks for conflicts between GPIO pins used. The pHat Stack is just daisy chained GPIO connectors.

Ok thanks..I'll check that out tonight.